28138 Parallax Inc, 28138 Datasheet - Page 6

• Manufacturer Part Number: 28138
• Description: BOARD DEV PROFESSIONAL
• Manufacturer: Parallax Inc
• Series: BASIC Stamp®r
• Type: MCUr

Specifications of 28138

• Contents: Development Board
• Processor To Be Evaluated: SX28AC/DP
• Interface Type: RS-232
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: BASIC Stamp®, Javelin Stamp, and SX28AC/DP
• For Use With: 900-00014 - SERVO CONTROLLER PICO GWS130-28029 - KIT PARTS SMART SENSORS27957 - MANUAL USER FOR JAVELIN STAMP28138 - BOARD DEV PROFESSIONAL805-00006 - CABLE USB A TO MINI B27937 - MEMORY STICK DATALOGGER658-1021-5 - PROGRAMMER TEACLIPPER/STAMP30010 - BASIC STAMP LOGIC ANALYZER27220 - BOOK STAMPWORKS27330 - PROGRAMMER STACHE BASIC STAMP27218 - MANUAL BASIC STAMP VER 2.0
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

BS2p40 Pin Connections
Due to the physical pin configuration of the BS2p40, connections to the MAINIO (M) and AUXIO (A) pins
are distributed between the BASIC Stamp and SX28AC/DP connectors. Use the tables below when
using the BS2p40 on the PDB.
Circuit Diagrams
The sections that follow describe the various circuits on the PDB, and provide hints and guidance for their
use.
Discrete LEDs (X17)
The PDB is equipped with 16 discrete LEDs, wired in an active-high configuration as shown below. To
illuminate an LED, drive its control pin (on X17) high.
7-Segment LED Displays (X19 and X18)
The PDB is equipped with five common-cathode, 7-segment LED displays. To illuminate a segment, that
segment (on X18) is driven high and the associated digit control line (on X19) is driven low (or connected
to Vss). Note that the displays are designed to be multiplexed (the segment lines are shared), hence a
suitable multiplexer like the MAX7219 or MC14489 should be used for BASIC Stamp or Javelin Stamp
applications. For simple, single-digit displays the digit control line may be connected directly to Vss.
6
RB0
RC0
M0
M8
P0
A0
A8
P8
RB1
RC1
M1
M9
P1
A1
A9
P9
© Parallax, Inc. • Professional Development Board (#28138) • 06/2005
RC2
M10
RB2
A10
P10
M2
P2
A2
RC3
M11
RB3
A11
P11
M3
P3
A3
RC4
M12
RB4
A12
P12
M4
P4
A4
RC5
M13
RB5
A13
P13
M5
P5
A5
RC6
M14
RB6
A14
P14
M6
P6
A6
M15
RB7
RC7
A15
P15
M7
P7
A7